Kangaroos cannot walk backwards. Their hopping movement is called saltation. During saltation, kangaroos push off with both large feet at the same time, and they use their tails for balance. The combination of their muscular legs, big feet and tails may help kangaroos move forward effectively, but they also prevent Kangaroos from going backwards.

Funny Facts

A lion can't actually roar until it is two years old. But when it does, it's so loud you can hear it five miles away Zebras are black with white stripes Sea Otters hold hands while they're sleeping, so they don't drift apart. Alberta, Canada is the largest rat-free populated area in the world A slug's blood has a greenish color. There's a basketball court above the US Supreme Court in Washington, D.C. It's known as the Highest Court in the Land. "twelve plus one" is an anagram of "eleven plus two" If you start counting at one and spell out the numbers as you go, you won't use the letter "a" until you reach 1,000. Marie Curie's notebooks are still radioactive. Researchers hoping to view them must sign a disclaimer. Israel's version of California's Silicon Valley is called Silicon Wadi as 'wadi' means 'Valley' in Hebrew. Thomas Edison did not invent electric light bulb. He invented the carbonized bamboo filament that made the bulb practical and affordable for home illumination. Slugs are hermaphrodite, having both male and female reproductive organs. Slugs have the capability to reproduce by themselves, although a mate is preferred. Hummingbirds can beat their wings up to 80 times a second during normal flight and up to 200 times per second during a courtship dive. Their heart rate can reach up to 1,260 beats per minute. Red-eyed tree frog eggs can hatch early if they sense danger. Blue jays mimic hawks' calls to scare away other birds. In the UK, the British monarch legally owns all unmarked mute swans in open water. All clownfish are born male—some turn female to enable mating. Moray eels have a second set of jaws that extends from their throats. Cats can't taste sugar. They don't have sweet taste buds.